Mechanism for grinding cards.



No. 662,743. Patented Nov. 27, |900. S. B. HOY.

MECHANISM FOR GRINDING CARDS.

(Application fled Nov. 3, 1899,)

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tween the grinding-roll and shell.

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MECHANISM FOR GRINDBNG CARDS.

.SPECIFICATION forming part of Letters Patent No, 662,743, dated November 27, 1900.

Application tiled November 3, 1899.

To all whom t may concern:

Be it known that LSYLVANUS B.ROY, a citizen of the United States, residing at Worcester, in the county of Worcester and Commonwealth of'Massachusetts, have in vented a new and usetul Improvement in Mechanism for Grinding Cards, ot which the following is a specification, accompanied by drawings forming a part of the same.

My invention relates to that class of cardgrinding mechanism which employs a traversing grinding-roll mounted upon a revolving hollow arbor or shell, with mechanism for imparting a traversing movement. to the grinding-roll on said shell during the operation of grinding.

The object of my invention is to provide means for compensating for the wear between the shell and the traversing roll in order to maintain the grinding-surface of the roll concentrically with the axis of the shell, and I accomplish this object by means of thedevice hereinafter described.

Referring to the drawings, Figure l represents a central longitudinal View of a rotating hollow arbor or shell with a traversing grinding-roll mounted thereon, with mechanism contained in the shell for traversing the grinding-roll. Fig. 2 is an end view of one of the tapered bushings which are inserted be- Fig. 3 is a central sectional view of the same. Fig. 4 is a central sectional view of the grinding-roll and a portion of the hollow arbor or shell, showing a modification of the device for adjusti ng the bearing between the grinding-roll and shell, embodyinga tapered bushing having ears to receive adjusting-screws; and Fig. 5 is a detached end view of the tapered bushing shown in Fig. 4.

Similar letters refer to similar parts in the different figures.

In the accompanying drawings, A A represent portions of the supporting-framework in which the hollow arbor or shell B is journaled and on which is mounted a grinding-roll C. Upon one ofthe gudgeons U of the shell B is mounted a pulleyD, by which the shell is rotated, and in the opposite gudgeon C2 is journaled ashaft E, driven by means ofa belt-pulleyE and carrying a beveled gear E2, by which Serial No. '735,727- (No model.)

motion is given through intermediate mechanism to an endless chain F, mounted on a sprocket-wheel F', and iianged pulley F2, supported on studs within the shell B. One of the links ot' the endless chain F is provided with a stud F3, which engages a slot G in the stem G of a T-shaped key having its head G`l attached to the inside of the hub of the grinding-roll C, with the stem G extending through a narrow longitudinal slot I-I, so that the rotation ofthe shell imparts a rotary motion to the grinding-roll C, while the movement of the chain F imparts a traversing motion to the grinding-roll back and forth along the shell B.

The above-described mechanism for rotating and traversing a grinding-roll is the same as that now in common use in traversing cardgrinders and forms no part of my present invention, which relates to the device, as hereinafter described, for taking up the wear between the shell B and the grinding-roll C.

In card-grinding mechanism extreme accuracy is required in grinding the wire face of the cards, and it is necessary that the grinding-surface of the roll be absolutely concentric with its axis of rotation. It is dit'- ficult to maintain the absolute concentricity of the grinding-surface of the roll during the continued use ot' the grinding mechanism, owing to the wear upon the hub ot' the grinding-roll caused byits traversing movement along the shell B.

In order to compensate for the wear due to the traversing movement of the roll on the shell, devices have been employed to hold the roll concentric with its axis of rotation; but such devices have been complicated and are extremely difficult of accurate adjustment.

I accomplish the adjustment of the grinding-roll concentrically with its axis of rotation by making the hole through the hub of the roll larger than the diameter of the shell B and with the hole larger at the ends of the hubs than at the center, forming a double taper from each end of the hub toward its center, and I insert in each end of the hub a tapering bushing I, which is cut apart on one side, as I', Fig. 2, to allow the bushing to be contracted in diameter and also to provide a space for the head G2 of the T-shaped key.

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The tapered bushings are also provided with equidistant grooves I2, preferably on the inner side of the bushing, in order to weaken the bushing at the grooves, so that when the bushings are compressed they will bend at the grooves without changing the curvature of the intermediate sections I3. In Fig. 2 one of the tapered bushings is represented in end view with three grooves I2, which, with the gap I', form four intermediate sections I3; but the number of grooves may be varied, if desired. The ends of the hub of the grinding-roll are provided with external screwthreads J to receive screw-threaded collars J', provided with flanges J2, overlapping the ends of the tapering bushings I, which are held against the flanges J2 by means of screws J3, which pass through the ianges J2 and are screwed into the ends of the tapered bushings I.

When itl is desired to take up the wearbetween the grii'iding-roll and the shell B, the screws J3 are withdrawn from the tapered bushings and the collars J are screwed upon the ends of the hub of the grinding-roll, thereby pressing each of the tapered bushings I into the hub and crowding'them against the tapered surfaces of the hub, thereby compressing the bushings, which bend at the grooves I2, carrying each of the sections toward the shell B and taking up the lost motion between the shell and the roll. In order to allow for the adjustment of the tapered bushings, they are provided with a series of screw-holes J4, so arranged that the collars J may be turned stated distances and the screws JV3 transferred from one screw-hole to another. The screws J3 serve to positively hold the tapered bushings in contact with the flanges J2. A sufficient space is preferably left between the inner ends of the tapered bushings I to provide for the insertion of an annular band of felt K, which is filled with lubricating material. In Figs. 4 and 5 I have shown a modification with respect to the tapered bushing and the method of forcing the tapered bushings into the hubs of the grindingrollsv Fig. 4representsasingle-tapered bushingL, inserted in the hub of the grinding-roll, which is provided with a single taper extending the entire length of the hub, and the bushing is provided on diametrically opposite sides with slotted ears L to receive adj usting-bolts L2,

which are screwed into screw-threaded holes L3 in the hub of the grinding-roll.

The tapered bushings, as shown in Fig. 3, have their inner surfaces parallel with the axis of the shell B and their outer surfaces tapered to correspond with the inner tapered surface of the hub on the grinding-roll C, and when the grooves I2 are formed upon the inner sides of the bushings, as represented in Fig. 3, I form a bottom N of the grooves parallel with the outer tapered surface of the bushing, so that the bushing at the bottom grooves willbe of uniform thickness throughout its entire width, making the grooves V shaped in longitudinal section.

What I claim as my invention, and desire to secure by Letters Patent, is-

l. In a card-grinding mechanism, the combination of a hollow arbor provided with a longitudinal slot, a T-shaped key having-its stem extending through said longitudinal slot and its head attached to a grinding-roll, a grinding-roll attached to said key and carried upon said arbor, means for imparting a reciprocating motion to said key, whereby said grinding-roll is traversed along said arbor, said grinding-roll having an internallytapered hub, a tapered bushing inserted between said hollow arbor and said tapered hub, said bushing having an opening on one side to receive the stem of said T-shaped key and having a series of equidistant longitudinal grooves V-shaped in their longitudinal section, whereby the bushing is of uniform thickness at the bottom of said grooves, and means for retaining said bushing in place,sub stantially as described. A

2. The combination with an arbor and a grinding-roll carried thereon, said roll having an internally-tapered hub, tapered bushings inserted between said hub and said arbor, screw-threaded collars engaging said hub, screws carried by said collars and held in screw-threaded holes in the ends of said bushings, substantially as described.

In testimony whereof I have signed my name to this specification, in presence of two subscribing witnesses, this 14th day of October, 1899.

SYLVANUS B. ROY.

Witnesses:

RUFUs B. FowLER, AVA T.. MURPHY.

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